<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <script>
    /*let l = "9.9超市";
    alert(parseInt(l));
    alert(parseFloat(l));
    alert(String(l));
    let ll = String(l);
    alert(ll+typeof ll);*/
    let l = "9.9超市";
    let ll = Number(l);
    document.write(typeof ll+"<br/>");
    let la = Boolean(l);
    alert(la);
    let e = "ckahci iucsn空间BBC";
    let t = encodeURI(e);
    document.write(t+"<br/>");
    let y = decodeURI(t);
    document.write(y);
  </script>
</head>
<body>

</body>
</html>